Most HGVs have been running Euro 4/5 Emission controls for a while
Generally a 40 litre tank will last 800 litres of Diseasel i think , so every other one would be about right
the dealings ive had with it all seem to be VERY temprimental , a Cold snap in the weather makes it throw a wobbley and go into "safe mode" sittin in stanstill traffic does the same
then not to mention the purity off the Add blue itself doesnt take well to contaminates
and of course drivers love putting - Diesel/hydraulic fluid/ATF - anything but add blue in the tank
